Refresh Rear Seat Covers for after hiking/trail running/mud runs

[Veregon]

Hey everyone, recently took delivery of my refresh S and I was wondering if anyone has any tips/recommendations for rear seat covers that act similarly to the pet covers where they cover the whole seat, have seat belt access, and optimally also cover the floor (unlike a pet cover that comes up to make a basket). We often do trail runs and obstacle course races where afterward we have a good amount of mud/dirt on us and our shoes even after rinsing off.

Thanks in advance!